/*!
 * Viewer.js v1.10.5
 * https://fengyuanchen.github.io/viewerjs
 *
 * Copyright 2015-present Chen Fengyuan
 * Released under the MIT license
 *
 * Date: 2022-04-05T08:21:02.491Z
 */

function ownKeys(object, enumerableOnly) {
    var keys = Object.keys(object);

    if (Object.getOwnPropertySymbols) {
        var symbols = Object.getOwnPropertySymbols(object);
        enumerableOnly && (symbols = symbols.filter(function (sym) {
            return Object.getOwnPropertyDescriptor(object, sym).enumerable;
        })), keys.push.apply(keys, symbols);
    }

    return keys;
}

function _objectSpread2(target) {
    for (var i = 1; i < arguments.length; i++) {
        var source = null != arguments[i] ? arguments[i] : {};
        i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
            _defineProperty(target, key, source[key]);
        }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
            Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
        });
    }

    return target;
}

function _typeof(obj) {
    "@babel/helpers - typeof";

    return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
        return typeof obj;
    } : function (obj) {
        return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    }, _typeof(obj);
}

function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
        throw new TypeError("Cannot call a class as a function");
    }
}

function _defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
        var descriptor = props[i];
        descriptor.enumerable = descriptor.enumerable || false;
        descriptor.configurable = true;
        if ("value" in descriptor) descriptor.writable = true;
        Object.defineProperty(target, descriptor.key, descriptor);
    }
}

function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    Object.defineProperty(Constructor, "prototype", {
        writable: false
    });
    return Constructor;
}

function _defineProperty(obj, key, value) {
    if (key in obj) {
        Object.defineProperty(obj, key, {
            value: value,
            enumerable: true,
            configurable: true,
            writable: true
        });
    } else {
        obj[key] = value;
    }

    return obj;
}

var DEFAULTS = {
    /**
     * Enable a modal backdrop, specify `static` for a backdrop
     * which doesn't close the modal on click.
     * @type {boolean}
     */
    backdrop: true,

    /**
     * Show the button on the top-right of the viewer.
     * @type {boolean}
     */
    button: true,

    /**
     * Show the navbar.
     * @type {boolean | number}
     */
    navbar: true,

    /**
     * Specify the visibility and the content of the title.
     * @type {boolean | number | Function | Array}
     */
    title: true,

    /**
     * Show the toolbar.
     * @type {boolean | number | Object}
     */
    toolbar: true,

    /**
     * Custom class name(s) to add to the viewer's root element.
     * @type {string}
     */
    className: '',

    /**
     * Define where to put the viewer in modal mode.
     * @type {string | Element}
     */
    container: 'body',

    /**
     * Filter the images for viewing. Return true if the image is viewable.
     * @type {Function}
     */
    filter: null,

    /**
     * Enable to request fullscreen when play.
     * {@link https://developer.mozilla.org/en-US/docs/Web/API/FullscreenOptions}
     * @type {boolean|FullscreenOptions}
     */
    fullscreen: true,

    /**
     * Define the extra attributes to inherit from the original image.
     * @type {Array}
     */
    inheritedAttributes: ['crossOrigin', 'decoding', 'isMap', 'loading', 'referrerPolicy', 'sizes', 'srcset', 'useMap'],

    /**
     * Define the initial index of image for viewing.
     * @type {number}
     */
    initialViewIndex: 0,

    /**
     * Enable inline mode.
     * @type {boolean}
     */
    inline: false,

    /**
     * The amount of time to delay between automatically cycling an image when playing.
     * @type {number}
     */
    interval: 5000,

    /**
     * Enable keyboard support.
     * @type {boolean}
     */
    keyboard: true,

    /**
     * Focus the viewer when initialized.
     * @type {boolean}
     */
    focus: true,

    /**
     * Indicate if show a loading spinner when load image or not.
     * @type {boolean}
     */
    loading: true,

    /**
     * Indicate if enable loop viewing or not.
     * @type {boolean}
     */
    loop: true,

    /**
     * Min width of the viewer in inline mode.
     * @type {number}
     */
    minWidth: 200,

    /**
     * Min height of the viewer in inline mode.
     * @type {number}
     */
    minHeight: 100,

    /**
     * Enable to move the image.
     * @type {boolean}
     */
    movable: true,

    /**
     * Enable to rotate the image.
     * @type {boolean}
     */
    rotatable: true,

    /**
     * Enable to scale the image.
     * @type {boolean}
     */
    scalable: true,

    /**
     * Enable to zoom the image.
     * @type {boolean}
     */
    zoomable: true,

    /**
     * Enable to zoom the current image by dragging on the touch screen.
     * @type {boolean}
     */
    zoomOnTouch: true,

    /**
     * Enable to zoom the image by wheeling mouse.
     * @type {boolean}
     */
    zoomOnWheel: true,

    /**
     * Enable to slide to the next or previous image by swiping on the touch screen.
     * @type {boolean}
     */
    slideOnTouch: true,

    /**
     * Indicate if toggle the image size between its natural size
     * and initial size when double click on the image or not.
     * @type {boolean}
     */
    toggleOnDblclick: true,

    /**
     * Show the tooltip with image ratio (percentage) when zoom in or zoom out.
     * @type {boolean}
     */
    tooltip: true,

    /**
     * Enable CSS3 Transition for some special elements.
     * @type {boolean}
     */
    transition: true,

    /**
     * Define the CSS `z-index` value of viewer in modal mode.
     * @type {number}
     */
    zIndex: 2015,

    /**
     * Define the CSS `z-index` value of viewer in inline mode.
     * @type {number}
     */
    zIndexInline: 0,

    /**
     * Define the ratio when zoom the image by wheeling mouse.
     * @type {number}
     */
    zoomRatio: 0.1,

    /**
     * Define the min ratio of the image when zoom out.
     * @type {number}
     */
    minZoomRatio: 0.01,

    /**
     * Define the max ratio of the image when zoom in.
     * @type {number}
     */
    maxZoomRatio: 100,

    /**
     * Define where to get the original image URL for viewing.
     * @type {string | Function}
     */
    url: 'src',

    /**
     * Event shortcuts.
     * @type {Function}
     */
    ready: null,
    show: null,
    shown: null,
    hide: null,
    hidden: null,
    view: null,
    viewed: null,
    move: null,
    moved: null,
    rotate: null,
    rotated: null,
    scale: null,
    scaled: null,
    zoom: null,
    zoomed: null,
    play: null,
    stop: null
};

var TEMPLATE = '<div class="viewer-container" tabindex="-1" touch-action="none">' + '<div class="viewer-canvas"></div>' + '<div class="viewer-footer">' + '<div class="viewer-title"></div>' + '<div class="viewer-toolbar"></div>' + '<div class="viewer-navbar">' + '<ul class="viewer-list" role="navigation"></ul>' + '</div>' + '</div>' + '<div class="viewer-tooltip" role="alert" aria-hidden="true"></div>' + '<div class="viewer-button" data-viewer-action="mix" role="button"></div>' + '<div class="viewer-player"></div>' + '</div>';

var IS_BROWSER = typeof window !== 'undefined' && typeof window.document !== 'undefined';
var WINDOW = IS_BROWSER ? window : {};
var IS_TOUCH_DEVICE = IS_BROWSER && WINDOW.document.documentElement ? 'ontouchstart' in WINDOW.document.documentElement : false;
var HAS_POINTER_EVENT = IS_BROWSER ? 'PointerEvent' in WINDOW : false;
var NAMESPACE = 'viewer'; // Actions

var ACTION_MOVE = 'move';
var ACTION_SWITCH = 'switch';
var ACTION_ZOOM = 'zoom'; // Classes

var CLASS_ACTIVE = "".concat(NAMESPACE, "-active");
var CLASS_CLOSE = "".concat(NAMESPACE, "-close");
var CLASS_FADE = "".concat(NAMESPACE, "-fade");
var CLASS_FIXED = "".concat(NAMESPACE, "-fixed");
var CLASS_FULLSCREEN = "".concat(NAMESPACE, "-fullscreen");
var CLASS_FULLSCREEN_EXIT = "".concat(NAMESPACE, "-fullscreen-exit");
var CLASS_HIDE = "".concat(NAMESPACE, "-hide");
var CLASS_HIDE_MD_DOWN = "".concat(NAMESPACE, "-hide-md-down");
var CLASS_HIDE_SM_DOWN = "".concat(NAMESPACE, "-hide-sm-down");
var CLASS_HIDE_XS_DOWN = "".concat(NAMESPACE, "-hide-xs-down");
var CLASS_IN = "".concat(NAMESPACE, "-in");
var CLASS_INVISIBLE = "".concat(NAMESPACE, "-invisible");
var CLASS_LOADING = "".concat(NAMESPACE, "-loading");
var CLASS_MOVE = "".concat(NAMESPACE, "-move");
var CLASS_OPEN = "".concat(NAMESPACE, "-open");
var CLASS_SHOW = "".concat(NAMESPACE, "-show");
var CLASS_TRANSITION = "".concat(NAMESPACE, "-transition"); // Native events

var EVENT_CLICK = 'click';
var EVENT_DBLCLICK = 'dblclick';
var EVENT_DRAG_START = 'dragstart';
var EVENT_FOCUSIN = 'focusin';
var EVENT_KEY_DOWN = 'keydown';
var EVENT_LOAD = 'load';
var EVENT_ERROR = 'error';
var EVENT_TOUCH_END = IS_TOUCH_DEVICE ? 'touchend touchcancel' : 'mouseup';
var EVENT_TOUCH_MOVE = IS_TOUCH_DEVICE ? 'touchmove' : 'mousemove';
var EVENT_TOUCH_START = IS_TOUCH_DEVICE ? 'touchstart' : 'mousedown';
var EVENT_POINTER_DOWN = HAS_POINTER_EVENT ? 'pointerdown' : EVENT_TOUCH_START;
var EVENT_POINTER_MOVE = HAS_POINTER_EVENT ? 'pointermove' : EVENT_TOUCH_MOVE;
var EVENT_POINTER_UP = HAS_POINTER_EVENT ? 'pointerup pointercancel' : EVENT_TOUCH_END;
var EVENT_RESIZE = 'resize';
var EVENT_TRANSITION_END = 'transitionend';
var EVENT_WHEEL = 'wheel'; // Custom events

var EVENT_READY = 'ready';
var EVENT_SHOW = 'show';
var EVENT_SHOWN = 'shown';
var EVENT_HIDE = 'hide';
var EVENT_HIDDEN = 'hidden';
var EVENT_VIEW = 'view';
var EVENT_VIEWED = 'viewed';
var EVENT_MOVE = 'move';
var EVENT_MOVED = 'moved';
var EVENT_ROTATE = 'rotate';
var EVENT_ROTATED = 'rotated';
var EVENT_SCALE = 'scale';
var EVENT_SCALED = 'scaled';
var EVENT_ZOOM = 'zoom';
var EVENT_ZOOMED = 'zoomed';
var EVENT_PLAY = 'play';
var EVENT_STOP = 'stop'; // Data keys

var DATA_ACTION = "".concat(NAMESPACE, "Action"); // RegExps

var REGEXP_SPACES = /\s\s*/; // Misc

var BUTTONS = ['zoom-in', 'zoom-out', 'one-to-one', 'reset', 'prev', 'play', 'next', 'rotate-left', 'rotate-right', 'flip-horizontal', 'flip-vertical'];

/**
 * Check if the given value is a string.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is a string, else `false`.
 */

function isString(value) {
    return typeof value === 'string';
}
/**
 * Check if the given value is not a number.
 */

var isNaN = Number.isNaN || WINDOW.isNaN;
/**
 * Check if the given value is a number.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is a number, else `false`.
 */

function isNumber(value) {
    return typeof value === 'number' && !isNaN(value);
}
/**
 * Check if the given value is undefined.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is undefined, else `false`.
 */

function isUndefined(value) {
    return typeof value === 'undefined';
}
/**
 * Check if the given value is an object.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is an object, else `false`.
 */

function isObject(value) {
    return _typeof(value) === 'object' && value !== null;
}
var hasOwnProperty = Object.prototype.hasOwnProperty;
/**
 * Check if the given value is a plain object.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is a plain object, else `false`.
 */

function isPlainObject(value) {
    if (!isObject(value)) {
        return false;
    }

    try {
        var _constructor = value.constructor;
        var prototype = _constructor.prototype;
        return _constructor && prototype && hasOwnProperty.call(prototype, 'isPrototypeOf');
    } catch (error) {
        return false;
    }
}
/**
 * Check if the given value is a function.
 * @param {*} value - The value to check.
 * @returns {boolean} Returns `true` if the given value is a function, else `false`.
 */

function isFunction(value) {
    return typeof value === 'function';
}
/**
 * Iterate the given data.
 * @param {*} data - The data to iterate.
 * @param {Function} callback - The process function for each element.
 * @returns {*} The original data.
 */

function forEach(data, callback) {
    if (data && isFunction(callback)) {
        if (Array.isArray(data) || isNumber(data.length)
            /* array-like */
        ) {
            var length = data.length;
            var i;

            for (i = 0; i < length; i += 1) {
                if (callback.call(data, data[i], i, data) === false) {
                    break;
                }
            }
        } else if (isObject(data)) {
            Object.keys(data).forEach(function (key) {
                callback.call(data, data[key], key, data);
            });
        }
    }

    return data;
}
/**
 * Extend the given object.
 * @param {*} obj - The object to be extended.
 * @param {*} args - The rest objects which will be merged to the first object.
 * @returns {Object} The extended object.
 */

var assign = Object.assign || function assign(obj) {
    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        args[_key - 1] = arguments[_key];
    }

    if (isObject(obj) && args.length > 0) {
        args.forEach(function (arg) {
            if (isObject(arg)) {
                Object.keys(arg).forEach(function (key) {
                    obj[key] = arg[key];
                });
            }
        });
    }

    return obj;
};
var REGEXP_SUFFIX = /^(?:width|height|left|top|marginLeft|marginTop)$/;
/**
 * Apply styles to the given element.
 * @param {Element} element - The target element.
 * @param {Object} styles - The styles for applying.
 */

function setStyle(element, styles) {
    var style = element.style;
    forEach(styles, function (value, property) {
        if (REGEXP_SUFFIX.test(property) && isNumber(value)) {
            value += 'px';
        }

        style[property] = value;
    });
}
/**
 * Escape a string for using in HTML.
 * @param {String} value - The string to escape.
 * @returns {String} Returns the escaped string.
 */

function escapeHTMLEntities(value) {
    return isString(value) ? value.replace(/&(?!amp;|quot;|#39;|lt;|gt;)/g, '&amp;').replace(/"/g, '&quot;').replace(/'/g, '&#39;').replace(/</g, '&lt;').replace(/>/g, '&gt;') : value;
}
/**
 * Check if the given element has a special class.
 * @param {Element} element - The element to check.
 * @param {string} value - The class to search.
 * @returns {boolean} Returns `true` if the special class was found.
 */

function hasClass(element, value) {
    if (!element || !value) {
        return false;
    }

    return element.classList ? element.classList.contains(value) : element.className.indexOf(value) > -1;
}
/**
 * Add classes to the given element.
 * @param {Element} element - The target element.
 * @param {string} value - The classes to be added.
 */

function addClass(element, value) {
    if (!element || !value) {
        return;
    }

    if (isNumber(element.length)) {
        forEach(element, function (elem) {
            addClass(elem, value);
        });
        return;
    }

    if (element.classList) {
        element.classList.add(value);
        return;
    }

    var className = element.className.trim();

    if (!className) {
        element.className = value;
    } else if (className.indexOf(value) < 0) {
        element.className = "".concat(className, " ").concat(value);
    }
}
/**
 * Remove classes from the given element.
 * @param {Element} element - The target element.
 * @param {string} value - The classes to be removed.
 */

function removeClass(element, value) {
    if (!element || !value) {
        return;
    }

    if (isNumber(element.length)) {
        forEach(element, function (elem) {
            removeClass(elem, value);
        });
        return;
    }

    if (element.classList) {
        element.classList.remove(value);
        return;
    }

    if (element.className.indexOf(value) >= 0) {
        element.className = element.className.replace(value, '');
    }
}
/**
 * Add or remove classes from the given element.
 * @param {Element} element - The target element.
 * @param {string} value - The classes to be toggled.
 * @param {boolean} added - Add only.
 */

function toggleClass(element, value, added) {
    if (!value) {
        return;
    }

    if (isNumber(element.length)) {
        forEach(element, function (elem) {
            toggleClass(elem, value, added);
        });
        return;
    } // IE10-11 doesn't support the second parameter of `classList.toggle`


    if (added) {
        addClass(element, value);
    } else {
        removeClass(element, value);
    }
}
var REGEXP_HYPHENATE = /([a-z\d])([A-Z])/g;
/**
 * Transform the given string from camelCase to kebab-case
 * @param {string} value - The value to transform.
 * @returns {string} The transformed value.
 */

function hyphenate(value) {
    return value.replace(REGEXP_HYPHENATE, '$1-$2').toLowerCase();
}
/**
 * Get data from the given element.
 * @param {Element} element - The target element.
 * @param {string} name - The data key to get.
 * @returns {string} The data value.
 */

function getData(element, name) {
    if (isObject(element[name])) {
        return element[name];
    }

    if (element.dataset) {
        return element.dataset[name];
    }

    return element.getAttribute("data-".concat(hyphenate(name)));
}
/**
 * Set data to the given element.
 * @param {Element} element - The target element.
 * @param {string} name - The data key to set.
 * @param {string} data - The data value.
 */

function setData(element, name, data) {
    if (isObject(data)) {
        element[name] = data;
    } else if (element.dataset) {
        element.dataset[name] = data;
    } else {
        element.setAttribute("data-".concat(hyphenate(name)), data);
    }
}

var onceSupported = function () {
    var supported = false;

    if (IS_BROWSER) {
        var once = false;

        var listener = function listener() {};

        var options = Object.defineProperty({}, 'once', {
            get: function get() {
                supported = true;
                return once;
            },

            /**
             * This setter can fix a `TypeError` in strict mode
             * {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Getter_only}
             * @param {boolean} value - The value to set
             */
            set: function set(value) {
                once = value;
            }
        });
        WINDOW.addEventListener('test', listener, options);
        WINDOW.removeEventListener('test', listener, options);
    }

    return supported;
}();
/**
 * Remove event listener from the target element.
 * @param {Element} element - The event target.
 * @param {string} type - The event type(s).
 * @param {Function} listener - The event listener.
 * @param {Object} options - The event options.
 */


function removeListener(element, type, listener) {
    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
    var handler = listener;
    type.trim().split(REGEXP_SPACES).forEach(function (event) {
        if (!onceSupported) {
            var listeners = element.listeners;

            if (listeners && listeners[event] && listeners[event][listener]) {
                handler = listeners[event][listener];
                delete listeners[event][listener];

                if (Object.keys(listeners[event]).length === 0) {
                    delete listeners[event];
                }

                if (Object.keys(listeners).length === 0) {
                    delete element.listeners;
                }
            }
        }

        element.removeEventListener(event, handler, options);
    });
}
/**
 * Add event listener to the target element.
 * @param {Element} element - The event target.
 * @param {string} type - The event type(s).
 * @param {Function} listener - The event listener.
 * @param {Object} options - The event options.
 */

function addListener(element, type, listener) {
    var options = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
    var _handler = listener;
    type.trim().split(REGEXP_SPACES).forEach(function (event) {
        if (options.once && !onceSupported) {
            var _element$listeners = element.listeners,
                listeners = _element$listeners === void 0 ? {} : _element$listeners;

            _handler = function handler() {
                delete listeners[event][listener];
                element.removeEventListener(event, _handler, options);

                for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
                    args[_key2] = arguments[_key2];
                }

                listener.apply(element, args);
            };

            if (!listeners[event]) {
                listeners[event] = {};
            }

            if (listeners[event][listener]) {
                element.removeEventListener(event, listeners[event][listener], options);
            }

            listeners[event][listener] = _handler;
            element.listeners = listeners;
        }

        element.addEventListener(event, _handler, options);
    });
}
/**
 * Dispatch event on the target element.
 * @param {Element} element - The event target.
 * @param {string} type - The event type(s).
 * @param {Object} data - The additional event data.
 * @param {Object} options - The additional event options.
 * @returns {boolean} Indicate if the event is default prevented or not.
 */

function dispatchEvent(element, type, data, options) {
    var event; // Event and CustomEvent on IE9-11 are global objects, not constructors

    if (isFunction(Event) && isFunction(CustomEvent)) {
        event = new CustomEvent(type, _objectSpread2({
            bubbles: true,
            cancelable: true,
            detail: data
        }, options));
    } else {
        event = document.createEvent('CustomEvent');
        event.initCustomEvent(type, true, true, data);
    }

    return element.dispatchEvent(event);
}
/**
 * Get the offset base on the document.
 * @param {Element} element - The target element.
 * @returns {Object} The offset data.
 */

function getOffset(element) {
    var box = element.getBoundingClientRect();
    return {
        left: box.left + (window.pageXOffset - document.documentElement.clientLeft),
        top: box.top + (window.pageYOffset - document.documentElement.clientTop)
    };
}
/**
 * Get transforms base on the given object.
 * @param {Object} obj - The target object.
 * @returns {string} A string contains transform values.
 */

function getTransforms(_ref) {
    var rotate = _ref.rotate,
        scaleX = _ref.scaleX,
        scaleY = _ref.scaleY,
        translateX = _ref.translateX,
        translateY = _ref.translateY;
    var values = [];

    if (isNumber(translateX) && translateX !== 0) {
        values.push("translateX(".concat(translateX, "px)"));
    }

    if (isNumber(translateY) && translateY !== 0) {
        values.push("translateY(".concat(translateY, "px)"));
    } // Rotate should come first before scale to match orientation transform


    if (isNumber(rotate) && rotate !== 0) {
        values.push("rotate(".concat(rotate, "deg)"));
    }

    if (isNumber(scaleX) && scaleX !== 1) {
        values.push("scaleX(".concat(scaleX, ")"));
    }

    if (isNumber(scaleY) && scaleY !== 1) {
        values.push("scaleY(".concat(scaleY, ")"));
    }

    var transform = values.length ? values.join(' ') : 'none';
    return {
        WebkitTransform: transform,
        msTransform: transform,
        transform: transform
    };
}
/**
 * Get an image name from an image url.
 * @param {string} url - The target url.
 * @example
 * // picture.jpg
 * getImageNameFromURL('https://domain.com/path/to/picture.jpg?size=1280×960')
 * @returns {string} A string contains the image name.
 */

function getImageNameFromURL(url) {
    return isString(url) ? decodeURIComponent(url.replace(/^.*\//, '').replace(/[?&#].*$/, '')) : '';
}
var IS_SAFARI = WINDOW.navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(WINDOW.navigator.userAgent);
/**
 * Get an image's natural sizes.
 * @param {string} image - The target image.
 * @param {Object} options - The viewer options.
 * @param {Function} callback - The callback function.
 * @returns {HTMLImageElement} The new image.
 */

function getImageNaturalSizes(image, options, callback) {
    var newImage = document.createElement('img'); // Modern browsers (except Safari)

    if (image.naturalWidth && !IS_SAFARI) {
        callback(image.naturalWidth, image.naturalHeight);
        return newImage;
    }

    var body = document.body || document.documentElement;

    newImage.onload = function () {
        callback(newImage.width, newImage.height);

        if (!IS_SAFARI) {
            body.removeChild(newImage);
        }
    };

    forEach(options.inheritedAttributes, function (name) {
        var value = image.getAttribute(name);

        if (value !== null) {
            newImage.setAttribute(name, value);
        }
    });
    newImage.src = image.src; // iOS Safari will convert the image automatically
    // with its orientation once append it into DOM

    if (!IS_SAFARI) {
        newImage.style.cssText = 'left:0;' + 'max-height:none!important;' + 'max-width:none!important;' + 'min-height:0!important;' + 'min-width:0!important;' + 'opacity:0;' + 'position:absolute;' + 'top:0;' + 'z-index:-1;';
        body.appendChild(newImage);
    }

    return newImage;
}
/**
 * Get the related class name of a responsive type number.
 * @param {string} type - The responsive type.
 * @returns {string} The related class name.
 */

function getResponsiveClass(type) {
    switch (type) {
        case 2:
            return CLASS_HIDE_XS_DOWN;

        case 3:
            return CLASS_HIDE_SM_DOWN;

        case 4:
            return CLASS_HIDE_MD_DOWN;

        default:
            return '';
    }
}
/**
 * Get the max ratio of a group of pointers.
 * @param {string} pointers - The target pointers.
 * @returns {number} The result ratio.
 */

function getMaxZoomRatio(pointers) {
    var pointers2 = _objectSpread2({}, pointers);

    var ratios = [];
    forEach(pointers, function (pointer, pointerId) {
        delete pointers2[pointerId];
        forEach(pointers2, function (pointer2) {
            var x1 = Math.abs(pointer.startX - pointer2.startX);
            var y1 = Math.abs(pointer.startY - pointer2.startY);
            var x2 = Math.abs(pointer.endX - pointer2.endX);
            var y2 = Math.abs(pointer.endY - pointer2.endY);
            var z1 = Math.sqrt(x1 * x1 + y1 * y1);
            var z2 = Math.sqrt(x2 * x2 + y2 * y2);
            var ratio = (z2 - z1) / z1;
            ratios.push(ratio);
        });
    });
    ratios.sort(function (a, b) {
        return Math.abs(a) < Math.abs(b);
    });
    return ratios[0];
}
/**
 * Get a pointer from an event object.
 * @param {Object} event - The target event object.
 * @param {boolean} endOnly - Indicates if only returns the end point coordinate or not.
 * @returns {Object} The result pointer contains start and/or end point coordinates.
 */

function getPointer(_ref2, endOnly) {
    var pageX = _ref2.pageX,
        pageY = _ref2.pageY;
    var end = {
        endX: pageX,
        endY: pageY
    };
    return endOnly ? end : _objectSpread2({
        timeStamp: Date.now(),
        startX: pageX,
        startY: pageY
    }, end);
}
/**
 * Get the center point coordinate of a group of pointers.
 * @param {Object} pointers - The target pointers.
 * @returns {Object} The center point coordinate.
 */

function getPointersCenter(pointers) {
    var pageX = 0;
    var pageY = 0;
    var count = 0;
    forEach(pointers, function (_ref3) {
        var startX = _ref3.startX,
            startY = _ref3.startY;
        pageX += startX;
        pageY += startY;
        count += 1;
    });
    pageX /= count;
    pageY /= count;
    return {
        pageX: pageX,
        pageY: pageY
    };
}

var render = {
    render: function render() {
        this.initContainer();
        this.initViewer();
        this.initList();
        this.renderViewer();
    },
    initBody: function initBody() {
        var ownerDocument = this.element.ownerDocument;
        var body = ownerDocument.body || ownerDocument.documentElement;
        this.body = body;
        this.scrollbarWidth = window.innerWidth - ownerDocument.documentElement.clientWidth;
        this.initialBodyPaddingRight = body.style.paddingRight;
        this.initialBodyComputedPaddingRight = window.getComputedStyle(body).paddingRight;
    },
    initContainer: function initContainer() {
        this.containerData = {
            width: window.innerWidth,
            height: window.innerHeight
        };
    },
    initViewer: function initViewer() {
        var options = this.options,
            parent = this.parent;
        var viewerData;

        if (options.inline) {
            viewerData = {
                width: Math.max(parent.offsetWidth, options.minWidth),
                height: Math.max(parent.offsetHeight, options.minHeight)
            };
            this.parentData = viewerData;
        }

        if (this.fulled || !viewerData) {
            viewerData = this.containerData;
        }

        this.viewerData = assign({}, viewerData);
    },
    renderViewer: function renderViewer() {
        if (this.options.inline && !this.fulled) {
            setStyle(this.viewer, this.viewerData);
        }
    },
    initList: function initList() {
        var _this = this;

        var element = this.element,
            options = this.options,
            list = this.list;
        var items = []; // initList may be called in this.update, so should keep idempotent

        list.innerHTML = '';
        forEach(this.images, function (image, index) {
            var src = image.src;
            var alt = image.alt || getImageNameFromURL(src);

            var url = _this.getImageURL(image);

            if (src || url) {
                var item = document.createElement('li');
                var img = document.createElement('img');
                forEach(options.inheritedAttributes, function (name) {
                    var value = image.getAttribute(name);

                    if (value !== null) {
                        img.setAttribute(name, value);
                    }
                });
                img.src = src || url;
                img.alt = alt;
                img.setAttribute('data-original-url', url || src);
                item.setAttribute('data-index', index);
                item.setAttribute('data-viewer-action', 'view');
                item.setAttribute('role', 'button');

                if (options.keyboard) {
                    item.setAttribute('tabindex', 0);
                }

                item.appendChild(img);
                list.appendChild(item);
                items.push(item);
            }
        });
        this.items = items;
        forEach(items, function (item) {
            var image = item.firstElementChild;
            var onLoad;
            var onError;
            setData(image, 'filled', true);

            if (options.loading) {
                addClass(item, CLASS_LOADING);
            }

            addListener(image, EVENT_LOAD, onLoad = function onLoad(event) {
                removeListener(image, EVENT_ERROR, onError);

                if (options.loading) {
                    removeClass(item, CLASS_LOADING);
                }

                _this.loadImage(event);
            }, {
                once: true
            });
            addListener(image, EVENT_ERROR, onError = function onError() {
                removeListener(image, EVENT_LOAD, onLoad);

                if (options.loading) {
                    removeClass(item, CLASS_LOADING);
                }
            }, {
                once: true
            });
        });

        if (options.transition) {
            addListener(element, EVENT_VIEWED, function () {
                addClass(list, CLASS_TRANSITION);
            }, {
                once: true
            });
        }
    },
    renderList: function renderList() {
        var index = this.index;
        var item = this.items[index];

        if (!item) {
            return;
        }

        var next = item.nextElementSibling;
        var gutter = parseInt(window.getComputedStyle(next || item).marginLeft, 10);
        var offsetWidth = item.offsetWidth;
        var outerWidth = offsetWidth + gutter; // Place the active item in the center of the screen

        setStyle(this.list, assign({
            width: outerWidth * this.length - gutter
        }, getTransforms({
            translateX: (this.viewerData.width - offsetWidth) / 2 - outerWidth * index
        })));
    },
    resetList: function resetList() {
        var list = this.list;
        list.innerHTML = '';
        removeClass(list, CLASS_TRANSITION);
        setStyle(list, getTransforms({
            translateX: 0
        }));
    },
    initImage: function initImage(done) {
        var _this2 = this;

        var options = this.options,
            image = this.image,
            viewerData = this.viewerData;
        var footerHeight = this.footer.offsetHeight;
        var viewerWidth = viewerData.width;
        var viewerHeight = Math.max(viewerData.height - footerHeight, footerHeight);
        var oldImageData = this.imageData || {};
        var sizingImage;
        this.imageInitializing = {
            abort: function abort() {
                sizingImage.onload = null;
            }
        };
        sizingImage = getImageNaturalSizes(image, options, function (naturalWidth, naturalHeight) {
            var aspectRatio = naturalWidth / naturalHeight;
            var width = viewerWidth;
            var height = viewerHeight;
            _this2.imageInitializing = false;

            if (viewerHeight * aspectRatio > viewerWidth) {
                height = viewerWidth / aspectRatio;
            } else {
                width = viewerHeight * aspectRatio;
            }

            width = Math.min(width * 0.9, naturalWidth);
            height = Math.min(height * 0.9, naturalHeight);
            var left = (viewerWidth - width) / 2;
            var top = (viewerHeight - height) / 2;
            var imageData = {
                left: left,
                top: top,
                x: left,
                y: top,
                width: width,
                height: height,
                oldRatio: 1,
                ratio: width / naturalWidth,
                aspectRatio: aspectRatio,
                naturalWidth: naturalWidth,
                naturalHeight: naturalHeight
            };
            var initialImageData = assign({}, imageData);

            if (options.rotatable) {
                imageData.rotate = oldImageData.rotate || 0;
                initialImageData.rotate = 0;
            }

            if (options.scalable) {
                imageData.scaleX = oldImageData.scaleX || 1;
                imageData.scaleY = oldImageData.scaleY || 1;
                initialImageData.scaleX = 1;
                initialImageData.scaleY = 1;
            }

            _this2.imageData = imageData;
            _this2.initialImageData = initialImageData;

            if (done) {
                done();
            }
        });
    },
    renderImage: function renderImage(done) {
        var _this3 = this;

        var image = this.image,
            imageData = this.imageData;
        setStyle(image, assign({
            width: imageData.width,
            height: imageData.height,
            // XXX: Not to use translateX/Y to avoid image shaking when zooming
            marginLeft: imageData.x,
            marginTop: imageData.y
        }, getTransforms(imageData)));

        if (done) {
            if ((this.viewing || this.moving || this.rotating || this.scaling || this.zooming) && this.options.transition && hasClass(image, CLASS_TRANSITION)) {
                var onTransitionEnd = function onTransitionEnd() {
                    _this3.imageRendering = false;
                    done();
                };

                this.imageRendering = {
                    abort: function abort() {
                        removeListener(image, EVENT_TRANSITION_END, onTransitionEnd);
                    }
                };
                addListener(image, EVENT_TRANSITION_END, onTransitionEnd, {
                    once: true
                });
            } else {
                done();
            }
        }
    },
    resetImage: function resetImage() {
        // this.image only defined after viewed
        if (this.viewing || this.viewed) {
            var image = this.image;

            if (this.viewing) {
                this.viewing.abort();
            }

            image.parentNode.removeChild(image);
            this.image = null;
        }
    }
};

var events = {
    bind: function bind() {
        var options = this.options,
            viewer = this.viewer,
            canvas = this.canvas;
        var document = this.element.ownerDocument;
        addListener(viewer, EVENT_CLICK, this.onClick = this.click.bind(this));
        addListener(viewer, EVENT_DRAG_START, this.onDragStart = this.dragstart.bind(this));
        addListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown = this.pointerdown.bind(this));
        addListener(document, EVENT_POINTER_MOVE, this.onPointerMove = this.pointermove.bind(this));
        addListener(document, EVENT_POINTER_UP, this.onPointerUp = this.pointerup.bind(this));
        addListener(document, EVENT_KEY_DOWN, this.onKeyDown = this.keydown.bind(this));
        addListener(window, EVENT_RESIZE, this.onResize = this.resize.bind(this));

        if (options.zoomable && options.zoomOnWheel) {
            addListener(viewer, EVENT_WHEEL, this.onWheel = this.wheel.bind(this), {
                passive: false,
                capture: true
            });
        }

        if (options.toggleOnDblclick) {
            addListener(canvas, EVENT_DBLCLICK, this.onDblclick = this.dblclick.bind(this));
        }
    },
    unbind: function unbind() {
        var options = this.options,
            viewer = this.viewer,
            canvas = this.canvas;
        var document = this.element.ownerDocument;
        removeListener(viewer, EVENT_CLICK, this.onClick);
        removeListener(viewer, EVENT_DRAG_START, this.onDragStart);
        removeListener(canvas, EVENT_POINTER_DOWN, this.onPointerDown);
        removeListener(document, EVENT_POINTER_MOVE, this.onPointerMove);
        removeListener(document, EVENT_POINTER_UP, this.onPointerUp);
        removeListener(document, EVENT_KEY_DOWN, this.onKeyDown);
        removeListener(window, EVENT_RESIZE, this.onResize);

        if (options.zoomable && options.zoomOnWheel) {
            removeListener(viewer, EVENT_WHEEL, this.onWheel, {
                passive: false,
                capture: true
            });
        }

        if (options.toggleOnDblclick) {
            removeListener(canvas, EVENT_DBLCLICK, this.onDblclick);
        }
    }
};

var handlers = {
    click: function click(event) {
        var options = this.options,
            imageData = this.imageData;
        var target = event.target;
        var action = getData(target, DATA_ACTION);

        if (!action && target.localName === 'img' && target.parentElement.localName === 'li') {
            target = target.parentElement;
            action = getData(target, DATA_ACTION);
        } // Cancel the emulated click when the native click event was triggered.


        if (IS_TOUCH_DEVICE && event.isTrusted && target === this.canvas) {
            clearTimeout(this.clickCanvasTimeout);
        }

        switch (action) {
            case 'mix':
                if (this.played) {
                    this.stop();
                } else if (options.inline) {
                    if (this.fulled) {
                        this.exit();
                    } else {
                        this.full();
                    }
                } else {
                    this.hide();
                }

                break;

            case 'hide':
                this.hide();
                break;

            case 'view':
                this.view(getData(target, 'index'));
                break;

            case 'zoom-in':
                this.zoom(0.1, true);
                break;

            case 'zoom-out':
                this.zoom(-0.1, true);
                break;

            case 'one-to-one':
                this.toggle();
                break;

            case 'reset':
                this.reset();
                break;

            case 'prev':
                this.prev(options.loop);
                break;

            case 'play':
                this.play(options.fullscreen);
                break;

            case 'next':
                this.next(options.loop);
                break;

            case 'rotate-left':
                this.rotate(-90);
                break;

            case 'rotate-right':
                this.rotate(90);
                break;

            case 'flip-horizontal':
                this.scaleX(-imageData.scaleX || -1);
                break;

            case 'flip-vertical':
                this.scaleY(-imageData.scaleY || -1);
                break;

            default:
                if (this.played) {
                    this.stop();
                }

        }
    },
    dblclick: function dblclick(event) {
        event.preventDefault();

        if (this.viewed && event.target === this.image) {
            // Cancel the emulated double click when the native dblclick event was triggered.
            if (IS_TOUCH_DEVICE && event.isTrusted) {
                clearTimeout(this.doubleClickImageTimeout);
            } // XXX: No pageX/Y properties in custom event, fallback to the original event.


            this.toggle(event.isTrusted ? event : event.detail && event.detail.originalEvent);
        }
    },
    load: function load() {
        var _this = this;

        if (this.timeout) {
            clearTimeout(this.timeout);
            this.timeout = false;
        }

        var element = this.element,
            options = this.options,
            image = this.image,
            index = this.index,
            viewerData = this.viewerData;
        removeClass(image, CLASS_INVISIBLE);

        if (options.loading) {
            removeClass(this.canvas, CLASS_LOADING);
        }

        image.style.cssText = 'height:0;' + "margin-left:".concat(viewerData.width / 2, "px;") + "margin-top:".concat(viewerData.height / 2, "px;") + 'max-width:none!important;' + 'position:relative;' + 'width:0;';
        this.initImage(function () {
            toggleClass(image, CLASS_MOVE, options.movable);
            toggleClass(image, CLASS_TRANSITION, options.transition);

            _this.renderImage(function () {
                _this.viewed = true;
                _this.viewing = false;

                if (isFunction(options.viewed)) {
                    addListener(element, EVENT_VIEWED, options.viewed, {
                        once: true
                    });
                }

                dispatchEvent(element, EVENT_VIEWED, {
                    originalImage: _this.images[index],
                    index: index,
                    image: image
                }, {
                    cancelable: false
                });
            });
        });
    },
    loadImage: function loadImage(event) {
        var image = event.target;
        var parent = image.parentNode;
        var parentWidth = parent.offsetWidth || 30;
        var parentHeight = parent.offsetHeight || 50;
        var filled = !!getData(image, 'filled');
        getImageNaturalSizes(image, this.options, function (naturalWidth, naturalHeight) {
            var aspectRatio = naturalWidth / naturalHeight;
            var width = parentWidth;
            var height = parentHeight;

            if (parentHeight * aspectRatio > parentWidth) {
                if (filled) {
                    width = parentHeight * aspectRatio;
                } else {
                    height = parentWidth / aspectRatio;
                }
            } else if (filled) {
                height = parentWidth / aspectRatio;
            } else {
                width = parentHeight * aspectRatio;
            }

            setStyle(image, assign({
                width: width,
                height: height
            }, getTransforms({
                translateX: (parentWidth - width) / 2,
                translateY: (parentHeight - height) / 2
            })));
        });
    },
    keydown: function keydown(event) {
        var options = this.options;

        if (!options.keyboard) {
            return;
        }

        var keyCode = event.keyCode || event.which || event.charCode;

        switch (keyCode) {
            // Enter
            case 13:
                if (this.viewer.contains(event.target)) {
                    this.click(event);
                }

                break;
        }

        if (!this.fulled) {
            return;
        }

        switch (keyCode) {
            // Escape
            case 27:
                if (this.played) {
                    this.stop();
                } else if (options.inline) {
                    if (this.fulled) {
                        this.exit();
                    }
                } else {
                    this.hide();
                }

                break;
            // Space

            case 32:
                if (this.played) {
                    this.stop();
                }

                break;
            // ArrowLeft

            case 37:
                this.prev(options.loop);
                break;
            // ArrowUp

            case 38:
                // Prevent scroll on Firefox
                event.preventDefault(); // Zoom in

                this.zoom(options.zoomRatio, true);
                break;
            // ArrowRight

            case 39:
                this.next(options.loop);
                break;
            // ArrowDown

            case 40:
                // Prevent scroll on Firefox
                event.preventDefault(); // Zoom out

                this.zoom(-options.zoomRatio, true);
                break;
            // Ctrl + 0

            case 48: // Fall through
            // Ctrl + 1
            // eslint-disable-next-line no-fallthrough

            case 49:
                if (event.ctrlKey) {
                    event.preventDefault();
                    this.toggle();
                }

                break;
        }
    },
    dragstart: function dragstart(event) {
        if (event.target.localName === 'img') {
            event.preventDefault();
        }
    },
    pointerdown: function pointerdown(event) {
        var options = this.options,
            pointers = this.pointers;
        var buttons = event.buttons,
            button = event.button;

        if (!this.viewed || this.showing || this.viewing || this.hiding // Handle mouse event and pointer event and ignore touch event
            || (event.type === 'mousedown' || event.type === 'pointerdown' && event.pointerType === 'mouse') && ( // No primary button (Usually the left button)
                isNumber(buttons) && buttons !== 1 || isNumber(button) && button !== 0 // Open context menu
                || event.ctrlKey)) {
            return;
        } // Prevent default behaviours as page zooming in touch devices.


        event.preventDefault();

        if (event.changedTouches) {
            forEach(event.changedTouches, function (touch) {
                pointers[touch.identifier] = getPointer(touch);
            });
        } else {
            pointers[event.pointerId || 0] = getPointer(event);
        }

        var action = options.movable ? ACTION_MOVE : false;

        if (options.zoomOnTouch && options.zoomable && Object.keys(pointers).length > 1) {
            action = ACTION_ZOOM;
        } else if (options.slideOnTouch && (event.pointerType === 'touch' || event.type === 'touchstart') && this.isSwitchable()) {
            action = ACTION_SWITCH;
        }

        if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
            removeClass(this.image, CLASS_TRANSITION);
        }

        this.action = action;
    },
    pointermove: function pointermove(event) {
        var pointers = this.pointers,
            action = this.action;

        if (!this.viewed || !action) {
            return;
        }

        event.preventDefault();

        if (event.changedTouches) {
            forEach(event.changedTouches, function (touch) {
                assign(pointers[touch.identifier] || {}, getPointer(touch, true));
            });
        } else {
            assign(pointers[event.pointerId || 0] || {}, getPointer(event, true));
        }

        this.change(event);
    },
    pointerup: function pointerup(event) {
        var _this2 = this;

        var options = this.options,
            action = this.action,
            pointers = this.pointers;
        var pointer;

        if (event.changedTouches) {
            forEach(event.changedTouches, function (touch) {
                pointer = pointers[touch.identifier];
                delete pointers[touch.identifier];
            });
        } else {
            pointer = pointers[event.pointerId || 0];
            delete pointers[event.pointerId || 0];
        }

        if (!action) {
            return;
        }

        event.preventDefault();

        if (options.transition && (action === ACTION_MOVE || action === ACTION_ZOOM)) {
            addClass(this.image, CLASS_TRANSITION);
        }

        this.action = false; // Emulate click and double click in touch devices to support backdrop and image zooming (#210).

        if (IS_TOUCH_DEVICE && action !== ACTION_ZOOM && pointer && Date.now() - pointer.timeStamp < 500) {
            clearTimeout(this.clickCanvasTimeout);
            clearTimeout(this.doubleClickImageTimeout);

            if (options.toggleOnDblclick && this.viewed && event.target === this.image) {
                if (this.imageClicked) {
                    this.imageClicked = false; // This timeout will be cleared later when a native dblclick event is triggering

                    this.doubleClickImageTimeout = setTimeout(function () {
                        dispatchEvent(_this2.image, EVENT_DBLCLICK, {
                            originalEvent: event
                        });
                    }, 50);
                } else {
                    this.imageClicked = true; // The default timing of a double click in Windows is 500 ms

                    this.doubleClickImageTimeout = setTimeout(function () {
                        _this2.imageClicked = false;
                    }, 500);
                }
            } else {
                this.imageClicked = false;

                if (options.backdrop && options.backdrop !== 'static' && event.target === this.canvas) {
                    // This timeout will be cleared later when a native click event is triggering
                    this.clickCanvasTimeout = setTimeout(function () {
                        dispatchEvent(_this2.canvas, EVENT_CLICK, {
                            originalEvent: event
                        });
                    }, 50);
                }
            }
        }
    },
    resize: function resize() {
        var _this3 = this;

        if (!this.isShown || this.hiding) {
            return;
        }

        if (this.fulled) {
            this.close();
            this.initBody();
            this.open();
        }

        this.initContainer();
        this.initViewer();
        this.renderViewer();
        this.renderList();

        if (this.viewed) {
            this.initImage(function () {
                _this3.renderImage();
            });
        }

        if (this.played) {
            if (this.options.fullscreen && this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
                this.stop();
                return;
            }

            forEach(this.player.getElementsByTagName('img'), function (image) {
                addListener(image, EVENT_LOAD, _this3.loadImage.bind(_this3), {
                    once: true
                });
                dispatchEvent(image, EVENT_LOAD);
            });
        }
    },
    wheel: function wheel(event) {
        var _this4 = this;

        if (!this.viewed) {
            return;
        }

        event.preventDefault(); // Limit wheel speed to prevent zoom too fast

        if (this.wheeling) {
            return;
        }

        this.wheeling = true;
        setTimeout(function () {
            _this4.wheeling = false;
        }, 50);
        var ratio = Number(this.options.zoomRatio) || 0.1;
        var delta = 1;

        if (event.deltaY) {
            delta = event.deltaY > 0 ? 1 : -1;
        } else if (event.wheelDelta) {
            delta = -event.wheelDelta / 120;
        } else if (event.detail) {
            delta = event.detail > 0 ? 1 : -1;
        }

        this.zoom(-delta * ratio, true, event);
    }
};

var methods = {
    /** Show the viewer (only available in modal mode)
     * @param {boolean} [immediate=false] - Indicates if show the viewer immediately or not.
     * @returns {Viewer} this
     */
    show: function show() {
        var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var element = this.element,
            options = this.options;

        if (options.inline || this.showing || this.isShown || this.showing) {
            return this;
        }

        if (!this.ready) {
            this.build();

            if (this.ready) {
                this.show(immediate);
            }

            return this;
        }

        if (isFunction(options.show)) {
            addListener(element, EVENT_SHOW, options.show, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_SHOW) === false || !this.ready) {
            return this;
        }

        if (this.hiding) {
            this.transitioning.abort();
        }

        this.showing = true;
        this.open();
        var viewer = this.viewer;
        removeClass(viewer, CLASS_HIDE);
        viewer.setAttribute('role', 'dialog');
        viewer.setAttribute('aria-labelledby', this.title.id);
        viewer.setAttribute('aria-modal', true);
        viewer.removeAttribute('aria-hidden');

        if (options.transition && !immediate) {
            var shown = this.shown.bind(this);
            this.transitioning = {
                abort: function abort() {
                    removeListener(viewer, EVENT_TRANSITION_END, shown);
                    removeClass(viewer, CLASS_IN);
                }
            };
            addClass(viewer, CLASS_TRANSITION); // Force reflow to enable CSS3 transition

            viewer.initialOffsetWidth = viewer.offsetWidth;
            addListener(viewer, EVENT_TRANSITION_END, shown, {
                once: true
            });
            addClass(viewer, CLASS_IN);
        } else {
            addClass(viewer, CLASS_IN);
            this.shown();
        }

        return this;
    },

    /**
     * Hide the viewer (only available in modal mode)
     * @param {boolean} [immediate=false] - Indicates if hide the viewer immediately or not.
     * @returns {Viewer} this
     */
    hide: function hide() {
        var _this = this;

        var immediate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var element = this.element,
            options = this.options;

        if (options.inline || this.hiding || !(this.isShown || this.showing)) {
            return this;
        }

        if (isFunction(options.hide)) {
            addListener(element, EVENT_HIDE, options.hide, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_HIDE) === false) {
            return this;
        }

        if (this.showing) {
            this.transitioning.abort();
        }

        this.hiding = true;

        if (this.played) {
            this.stop();
        } else if (this.viewing) {
            this.viewing.abort();
        }

        var viewer = this.viewer,
            image = this.image;

        var hideImmediately = function hideImmediately() {
            removeClass(viewer, CLASS_IN);

            _this.hidden();
        };

        if (options.transition && !immediate) {
            var onViewerTransitionEnd = function onViewerTransitionEnd(event) {
                // Ignore all propagating `transitionend` events (#275).
                if (event && event.target === viewer) {
                    removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);

                    _this.hidden();
                }
            };

            var onImageTransitionEnd = function onImageTransitionEnd() {
                // In case of show the viewer by `viewer.show(true)` previously (#407).
                if (hasClass(viewer, CLASS_TRANSITION)) {
                    addListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
                    removeClass(viewer, CLASS_IN);
                } else {
                    hideImmediately();
                }
            };

            this.transitioning = {
                abort: function abort() {
                    if (_this.viewed && hasClass(image, CLASS_TRANSITION)) {
                        removeListener(image, EVENT_TRANSITION_END, onImageTransitionEnd);
                    } else if (hasClass(viewer, CLASS_TRANSITION)) {
                        removeListener(viewer, EVENT_TRANSITION_END, onViewerTransitionEnd);
                    }
                }
            }; // In case of hiding the viewer when holding on the image (#255),
            // note that the `CLASS_TRANSITION` class will be removed on pointer down.

            if (this.viewed && hasClass(image, CLASS_TRANSITION)) {
                addListener(image, EVENT_TRANSITION_END, onImageTransitionEnd, {
                    once: true
                });
                this.zoomTo(0, false, null, true);
            } else {
                onImageTransitionEnd();
            }
        } else {
            hideImmediately();
        }

        return this;
    },

    /**
     * View one of the images with image's index
     * @param {number} index - The index of the image to view.
     * @returns {Viewer} this
     */
    view: function view() {
        var _this2 = this;

        var index = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.options.initialViewIndex;
        index = Number(index) || 0;

        if (this.hiding || this.played || index < 0 || index >= this.length || this.viewed && index === this.index) {
            return this;
        }

        if (!this.isShown) {
            this.index = index;
            return this.show();
        }

        if (this.viewing) {
            this.viewing.abort();
        }

        var element = this.element,
            options = this.options,
            title = this.title,
            canvas = this.canvas;
        var item = this.items[index];
        var img = item.querySelector('img');
        var url = getData(img, 'originalUrl');
        var alt = img.getAttribute('alt');
        var image = document.createElement('img');
        forEach(options.inheritedAttributes, function (name) {
            var value = img.getAttribute(name);

            if (value !== null) {
                image.setAttribute(name, value);
            }
        });
        image.src = url;
        image.alt = alt;

        if (isFunction(options.view)) {
            addListener(element, EVENT_VIEW, options.view, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_VIEW, {
            originalImage: this.images[index],
            index: index,
            image: image
        }) === false || !this.isShown || this.hiding || this.played) {
            return this;
        }

        var activeItem = this.items[this.index];

        if (activeItem) {
            removeClass(activeItem, CLASS_ACTIVE);
            activeItem.removeAttribute('aria-selected');
        }

        addClass(item, CLASS_ACTIVE);
        item.setAttribute('aria-selected', true);

        if (options.focus) {
            item.focus();
        }

        this.image = image;
        this.viewed = false;
        this.index = index;
        this.imageData = {};
        addClass(image, CLASS_INVISIBLE);

        if (options.loading) {
            addClass(canvas, CLASS_LOADING);
        }

        canvas.innerHTML = '';
        canvas.appendChild(image); // Center current item

        this.renderList(); // Clear title

        title.innerHTML = ''; // Generate title after viewed

        var onViewed = function onViewed() {
            var imageData = _this2.imageData;
            var render = Array.isArray(options.title) ? options.title[1] : options.title;
            title.innerHTML = escapeHTMLEntities(isFunction(render) ? render.call(_this2, image, imageData) : "".concat(alt, " (").concat(imageData.naturalWidth, " \xD7 ").concat(imageData.naturalHeight, ")"));
        };

        var onLoad;
        var onError;
        addListener(element, EVENT_VIEWED, onViewed, {
            once: true
        });
        this.viewing = {
            abort: function abort() {
                removeListener(element, EVENT_VIEWED, onViewed);

                if (image.complete) {
                    if (_this2.imageRendering) {
                        _this2.imageRendering.abort();
                    } else if (_this2.imageInitializing) {
                        _this2.imageInitializing.abort();
                    }
                } else {
                    // Cancel download to save bandwidth.
                    image.src = '';
                    removeListener(image, EVENT_LOAD, onLoad);

                    if (_this2.timeout) {
                        clearTimeout(_this2.timeout);
                    }
                }
            }
        };

        if (image.complete) {
            this.load();
        } else {
            addListener(image, EVENT_LOAD, onLoad = function onLoad() {
                removeListener(image, EVENT_ERROR, onError);

                _this2.load();
            }, {
                once: true
            });
            addListener(image, EVENT_ERROR, onError = function onError() {
                removeListener(image, EVENT_LOAD, onLoad);

                if (_this2.timeout) {
                    clearTimeout(_this2.timeout);
                    _this2.timeout = false;
                }

                removeClass(image, CLASS_INVISIBLE);

                if (options.loading) {
                    removeClass(_this2.canvas, CLASS_LOADING);
                }
            }, {
                once: true
            });

            if (this.timeout) {
                clearTimeout(this.timeout);
            } // Make the image visible if it fails to load within 1s


            this.timeout = setTimeout(function () {
                removeClass(image, CLASS_INVISIBLE);
                _this2.timeout = false;
            }, 1000);
        }

        return this;
    },

    /**
     * View the previous image
     * @param {boolean} [loop=false] - Indicate if view the last one
     * when it is the first one at present.
     * @returns {Viewer} this
     */
    prev: function prev() {
        var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var index = this.index - 1;

        if (index < 0) {
            index = loop ? this.length - 1 : 0;
        }

        this.view(index);
        return this;
    },

    /**
     * View the next image
     * @param {boolean} [loop=false] - Indicate if view the first one
     * when it is the last one at present.
     * @returns {Viewer} this
     */
    next: function next() {
        var loop = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
        var maxIndex = this.length - 1;
        var index = this.index + 1;

        if (index > maxIndex) {
            index = loop ? 0 : maxIndex;
        }

        this.view(index);
        return this;
    },

    /**
     * Move the image with relative offsets.
     * @param {number} x - The moving distance in the horizontal direction.
     * @param {number} [y=x] The moving distance in the vertical direction.
     * @returns {Viewer} this
     */
    move: function move(x) {
        var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;
        var imageData = this.imageData;
        this.moveTo(isUndefined(x) ? x : imageData.x + Number(x), isUndefined(y) ? y : imageData.y + Number(y));
        return this;
    },

    /**
     * Move the image to an absolute point.
     * @param {number} x - The new position in the horizontal direction.
     * @param {number} [y=x] - The new position in the vertical direction.
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @returns {Viewer} this
     */
    moveTo: function moveTo(x) {
        var _this3 = this;

        var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : x;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        x = Number(x);
        y = Number(y);

        if (this.viewed && !this.played && options.movable) {
            var oldX = imageData.x;
            var oldY = imageData.y;
            var changed = false;

            if (isNumber(x)) {
                changed = true;
            } else {
                x = oldX;
            }

            if (isNumber(y)) {
                changed = true;
            } else {
                y = oldY;
            }

            if (changed) {
                if (isFunction(options.move)) {
                    addListener(element, EVENT_MOVE, options.move, {
                        once: true
                    });
                }

                if (dispatchEvent(element, EVENT_MOVE, {
                    x: x,
                    y: y,
                    oldX: oldX,
                    oldY: oldY,
                    originalEvent: _originalEvent
                }) === false) {
                    return this;
                }

                imageData.x = x;
                imageData.y = y;
                imageData.left = x;
                imageData.top = y;
                this.moving = true;
                this.renderImage(function () {
                    _this3.moving = false;

                    if (isFunction(options.moved)) {
                        addListener(element, EVENT_MOVED, options.moved, {
                            once: true
                        });
                    }

                    dispatchEvent(element, EVENT_MOVED, {
                        x: x,
                        y: y,
                        oldX: oldX,
                        oldY: oldY,
                        originalEvent: _originalEvent
                    }, {
                        cancelable: false
                    });
                });
            }
        }

        return this;
    },

    /**
     * Rotate the image with a relative degree.
     * @param {number} degree - The rotate degree.
     * @returns {Viewer} this
     */
    rotate: function rotate(degree) {
        this.rotateTo((this.imageData.rotate || 0) + Number(degree));
        return this;
    },

    /**
     * Rotate the image to an absolute degree.
     * @param {number} degree - The rotate degree.
     * @returns {Viewer} this
     */
    rotateTo: function rotateTo(degree) {
        var _this4 = this;

        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        degree = Number(degree);

        if (isNumber(degree) && this.viewed && !this.played && options.rotatable) {
            var oldDegree = imageData.rotate;

            if (isFunction(options.rotate)) {
                addListener(element, EVENT_ROTATE, options.rotate, {
                    once: true
                });
            }

            if (dispatchEvent(element, EVENT_ROTATE, {
                degree: degree,
                oldDegree: oldDegree
            }) === false) {
                return this;
            }

            imageData.rotate = degree;
            this.rotating = true;
            this.renderImage(function () {
                _this4.rotating = false;

                if (isFunction(options.rotated)) {
                    addListener(element, EVENT_ROTATED, options.rotated, {
                        once: true
                    });
                }

                dispatchEvent(element, EVENT_ROTATED, {
                    degree: degree,
                    oldDegree: oldDegree
                }, {
                    cancelable: false
                });
            });
        }

        return this;
    },

    /**
     * Scale the image on the x-axis.
     * @param {number} scaleX - The scale ratio on the x-axis.
     * @returns {Viewer} this
     */
    scaleX: function scaleX(_scaleX) {
        this.scale(_scaleX, this.imageData.scaleY);
        return this;
    },

    /**
     * Scale the image on the y-axis.
     * @param {number} scaleY - The scale ratio on the y-axis.
     * @returns {Viewer} this
     */
    scaleY: function scaleY(_scaleY) {
        this.scale(this.imageData.scaleX, _scaleY);
        return this;
    },

    /**
     * Scale the image.
     * @param {number} scaleX - The scale ratio on the x-axis.
     * @param {number} [scaleY=scaleX] - The scale ratio on the y-axis.
     * @returns {Viewer} this
     */
    scale: function scale(scaleX) {
        var _this5 = this;

        var scaleY = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : scaleX;
        var element = this.element,
            options = this.options,
            imageData = this.imageData;
        scaleX = Number(scaleX);
        scaleY = Number(scaleY);

        if (this.viewed && !this.played && options.scalable) {
            var oldScaleX = imageData.scaleX;
            var oldScaleY = imageData.scaleY;
            var changed = false;

            if (isNumber(scaleX)) {
                changed = true;
            } else {
                scaleX = oldScaleX;
            }

            if (isNumber(scaleY)) {
                changed = true;
            } else {
                scaleY = oldScaleY;
            }

            if (changed) {
                if (isFunction(options.scale)) {
                    addListener(element, EVENT_SCALE, options.scale, {
                        once: true
                    });
                }

                if (dispatchEvent(element, EVENT_SCALE, {
                    scaleX: scaleX,
                    scaleY: scaleY,
                    oldScaleX: oldScaleX,
                    oldScaleY: oldScaleY
                }) === false) {
                    return this;
                }

                imageData.scaleX = scaleX;
                imageData.scaleY = scaleY;
                this.scaling = true;
                this.renderImage(function () {
                    _this5.scaling = false;

                    if (isFunction(options.scaled)) {
                        addListener(element, EVENT_SCALED, options.scaled, {
                            once: true
                        });
                    }

                    dispatchEvent(element, EVENT_SCALED, {
                        scaleX: scaleX,
                        scaleY: scaleY,
                        oldScaleX: oldScaleX,
                        oldScaleY: oldScaleY
                    }, {
                        cancelable: false
                    });
                });
            }
        }

        return this;
    },

    /**
     * Zoom the image with a relative ratio.
     * @param {number} ratio - The target ratio.
     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @returns {Viewer} this
     */
    zoom: function zoom(ratio) {
        var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var imageData = this.imageData;
        ratio = Number(ratio);

        if (ratio < 0) {
            ratio = 1 / (1 - ratio);
        } else {
            ratio = 1 + ratio;
        }

        this.zoomTo(imageData.width * ratio / imageData.naturalWidth, hasTooltip, _originalEvent);
        return this;
    },

    /**
     * Zoom the image to an absolute ratio.
     * @param {number} ratio - The target ratio.
     * @param {boolean} [hasTooltip=false] - Indicates if it has a tooltip or not.
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @param {Event} [_zoomable=false] - Indicates if the current zoom is available or not.
     * @returns {Viewer} this
     */
    zoomTo: function zoomTo(ratio) {
        var _this6 = this;

        var hasTooltip = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

        var _originalEvent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;

        var _zoomable = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;

        var element = this.element,
            options = this.options,
            pointers = this.pointers,
            imageData = this.imageData;
        var x = imageData.x,
            y = imageData.y,
            width = imageData.width,
            height = imageData.height,
            naturalWidth = imageData.naturalWidth,
            naturalHeight = imageData.naturalHeight;
        ratio = Math.max(0, ratio);

        if (isNumber(ratio) && this.viewed && !this.played && (_zoomable || options.zoomable)) {
            if (!_zoomable) {
                var minZoomRatio = Math.max(0.01, options.minZoomRatio);
                var maxZoomRatio = Math.min(100, options.maxZoomRatio);
                ratio = Math.min(Math.max(ratio, minZoomRatio), maxZoomRatio);
            }

            if (_originalEvent) {
                switch (_originalEvent.type) {
                    case 'wheel':
                        if (options.zoomRatio >= 0.055 && ratio > 0.95 && ratio < 1.05) {
                            ratio = 1;
                        }

                        break;

                    case 'pointermove':
                    case 'touchmove':
                    case 'mousemove':
                        if (ratio > 0.99 && ratio < 1.01) {
                            ratio = 1;
                        }

                        break;
                }
            }

            var newWidth = naturalWidth * ratio;
            var newHeight = naturalHeight * ratio;
            var offsetWidth = newWidth - width;
            var offsetHeight = newHeight - height;
            var oldRatio = imageData.ratio;

            if (isFunction(options.zoom)) {
                addListener(element, EVENT_ZOOM, options.zoom, {
                    once: true
                });
            }

            if (dispatchEvent(element, EVENT_ZOOM, {
                ratio: ratio,
                oldRatio: oldRatio,
                originalEvent: _originalEvent
            }) === false) {
                return this;
            }

            this.zooming = true;

            if (_originalEvent) {
                var offset = getOffset(this.viewer);
                var center = pointers && Object.keys(pointers).length > 0 ? getPointersCenter(pointers) : {
                    pageX: _originalEvent.pageX,
                    pageY: _originalEvent.pageY
                }; // Zoom from the triggering point of the event

                imageData.x -= offsetWidth * ((center.pageX - offset.left - x) / width);
                imageData.y -= offsetHeight * ((center.pageY - offset.top - y) / height);
            } else {
                // Zoom from the center of the image
                imageData.x -= offsetWidth / 2;
                imageData.y -= offsetHeight / 2;
            }

            imageData.left = imageData.x;
            imageData.top = imageData.y;
            imageData.width = newWidth;
            imageData.height = newHeight;
            imageData.oldRatio = oldRatio;
            imageData.ratio = ratio;
            this.renderImage(function () {
                _this6.zooming = false;

                if (isFunction(options.zoomed)) {
                    addListener(element, EVENT_ZOOMED, options.zoomed, {
                        once: true
                    });
                }

                dispatchEvent(element, EVENT_ZOOMED, {
                    ratio: ratio,
                    oldRatio: oldRatio,
                    originalEvent: _originalEvent
                }, {
                    cancelable: false
                });
            });

            if (hasTooltip) {
                this.tooltip();
            }
        }

        return this;
    },

    /**
     * Play the images
     * @param {boolean|FullscreenOptions} [fullscreen=false] - Indicate if request fullscreen or not.
     * @returns {Viewer} this
     */
    play: function play() {
        var _this7 = this;

        var fullscreen = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;

        if (!this.isShown || this.played) {
            return this;
        }

        var element = this.element,
            options = this.options;

        if (isFunction(options.play)) {
            addListener(element, EVENT_PLAY, options.play, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_PLAY) === false) {
            return this;
        }

        var player = this.player;
        var onLoad = this.loadImage.bind(this);
        var list = [];
        var total = 0;
        var index = 0;
        this.played = true;
        this.onLoadWhenPlay = onLoad;

        if (fullscreen) {
            this.requestFullscreen(fullscreen);
        }

        addClass(player, CLASS_SHOW);
        forEach(this.items, function (item, i) {
            var img = item.querySelector('img');
            var image = document.createElement('img');
            image.src = getData(img, 'originalUrl');
            image.alt = img.getAttribute('alt');
            image.referrerPolicy = img.referrerPolicy;
            total += 1;
            addClass(image, CLASS_FADE);
            toggleClass(image, CLASS_TRANSITION, options.transition);

            if (hasClass(item, CLASS_ACTIVE)) {
                addClass(image, CLASS_IN);
                index = i;
            }

            list.push(image);
            addListener(image, EVENT_LOAD, onLoad, {
                once: true
            });
            player.appendChild(image);
        });

        if (isNumber(options.interval) && options.interval > 0) {
            var play = function play() {
                _this7.playing = setTimeout(function () {
                    removeClass(list[index], CLASS_IN);
                    index += 1;
                    index = index < total ? index : 0;
                    addClass(list[index], CLASS_IN);
                    play();
                }, options.interval);
            };

            if (total > 1) {
                play();
            }
        }

        return this;
    },
    // Stop play
    stop: function stop() {
        var _this8 = this;

        if (!this.played) {
            return this;
        }

        var element = this.element,
            options = this.options;

        if (isFunction(options.stop)) {
            addListener(element, EVENT_STOP, options.stop, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_STOP) === false) {
            return this;
        }

        var player = this.player;
        this.played = false;
        clearTimeout(this.playing);
        forEach(player.getElementsByTagName('img'), function (image) {
            removeListener(image, EVENT_LOAD, _this8.onLoadWhenPlay);
        });
        removeClass(player, CLASS_SHOW);
        player.innerHTML = '';
        this.exitFullscreen();
        return this;
    },
    // Enter modal mode (only available in inline mode)
    full: function full() {
        var _this9 = this;

        var options = this.options,
            viewer = this.viewer,
            image = this.image,
            list = this.list;

        if (!this.isShown || this.played || this.fulled || !options.inline) {
            return this;
        }

        this.fulled = true;
        this.open();
        addClass(this.button, CLASS_FULLSCREEN_EXIT);

        if (options.transition) {
            removeClass(list, CLASS_TRANSITION);

            if (this.viewed) {
                removeClass(image, CLASS_TRANSITION);
            }
        }

        addClass(viewer, CLASS_FIXED);
        viewer.setAttribute('role', 'dialog');
        viewer.setAttribute('aria-labelledby', this.title.id);
        viewer.setAttribute('aria-modal', true);
        viewer.removeAttribute('style');
        setStyle(viewer, {
            zIndex: options.zIndex
        });

        if (options.focus) {
            this.enforceFocus();
        }

        this.initContainer();
        this.viewerData = assign({}, this.containerData);
        this.renderList();

        if (this.viewed) {
            this.initImage(function () {
                _this9.renderImage(function () {
                    if (options.transition) {
                        setTimeout(function () {
                            addClass(image, CLASS_TRANSITION);
                            addClass(list, CLASS_TRANSITION);
                        }, 0);
                    }
                });
            });
        }

        return this;
    },
    // Exit modal mode (only available in inline mode)
    exit: function exit() {
        var _this10 = this;

        var options = this.options,
            viewer = this.viewer,
            image = this.image,
            list = this.list;

        if (!this.isShown || this.played || !this.fulled || !options.inline) {
            return this;
        }

        this.fulled = false;
        this.close();
        removeClass(this.button, CLASS_FULLSCREEN_EXIT);

        if (options.transition) {
            removeClass(list, CLASS_TRANSITION);

            if (this.viewed) {
                removeClass(image, CLASS_TRANSITION);
            }
        }

        if (options.focus) {
            this.clearEnforceFocus();
        }

        viewer.removeAttribute('role');
        viewer.removeAttribute('aria-labelledby');
        viewer.removeAttribute('aria-modal');
        removeClass(viewer, CLASS_FIXED);
        setStyle(viewer, {
            zIndex: options.zIndexInline
        });
        this.viewerData = assign({}, this.parentData);
        this.renderViewer();
        this.renderList();

        if (this.viewed) {
            this.initImage(function () {
                _this10.renderImage(function () {
                    if (options.transition) {
                        setTimeout(function () {
                            addClass(image, CLASS_TRANSITION);
                            addClass(list, CLASS_TRANSITION);
                        }, 0);
                    }
                });
            });
        }

        return this;
    },
    // Show the current ratio of the image with percentage
    tooltip: function tooltip() {
        var _this11 = this;

        var options = this.options,
            tooltipBox = this.tooltipBox,
            imageData = this.imageData;

        if (!this.viewed || this.played || !options.tooltip) {
            return this;
        }

        tooltipBox.textContent = "".concat(Math.round(imageData.ratio * 100), "%");

        if (!this.tooltipping) {
            if (options.transition) {
                if (this.fading) {
                    dispatchEvent(tooltipBox, EVENT_TRANSITION_END);
                }

                addClass(tooltipBox, CLASS_SHOW);
                addClass(tooltipBox, CLASS_FADE);
                addClass(tooltipBox, CLASS_TRANSITION);
                tooltipBox.removeAttribute('aria-hidden'); // Force reflow to enable CSS3 transition

                tooltipBox.initialOffsetWidth = tooltipBox.offsetWidth;
                addClass(tooltipBox, CLASS_IN);
            } else {
                addClass(tooltipBox, CLASS_SHOW);
                tooltipBox.removeAttribute('aria-hidden');
            }
        } else {
            clearTimeout(this.tooltipping);
        }

        this.tooltipping = setTimeout(function () {
            if (options.transition) {
                addListener(tooltipBox, EVENT_TRANSITION_END, function () {
                    removeClass(tooltipBox, CLASS_SHOW);
                    removeClass(tooltipBox, CLASS_FADE);
                    removeClass(tooltipBox, CLASS_TRANSITION);
                    tooltipBox.setAttribute('aria-hidden', true);
                    _this11.fading = false;
                }, {
                    once: true
                });
                removeClass(tooltipBox, CLASS_IN);
                _this11.fading = true;
            } else {
                removeClass(tooltipBox, CLASS_SHOW);
                tooltipBox.setAttribute('aria-hidden', true);
            }

            _this11.tooltipping = false;
        }, 1000);
        return this;
    },

    /**
     * Toggle the image size between its current size and natural size
     * @param {Event} [_originalEvent=null] - The original event if any.
     * @returns {Viewer} this
     */
    toggle: function toggle() {
        var _originalEvent = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;

        if (this.imageData.ratio === 1) {
            this.zoomTo(this.imageData.oldRatio, true, _originalEvent);
        } else {
            this.zoomTo(1, true, _originalEvent);
        }

        return this;
    },
    // Reset the image to its initial state
    reset: function reset() {
        if (this.viewed && !this.played) {
            this.imageData = assign({}, this.initialImageData);
            this.renderImage();
        }

        return this;
    },
    // Update viewer when images changed
    update: function update() {
        var _this12 = this;

        var element = this.element,
            options = this.options,
            isImg = this.isImg; // Destroy viewer if the target image was deleted

        if (isImg && !element.parentNode) {
            return this.destroy();
        }

        var images = [];
        forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
            if (isFunction(options.filter)) {
                if (options.filter.call(_this12, image)) {
                    images.push(image);
                }
            } else if (_this12.getImageURL(image)) {
                images.push(image);
            }
        });

        if (!images.length) {
            return this;
        }

        this.images = images;
        this.length = images.length;

        if (this.ready) {
            var changedIndexes = [];
            forEach(this.items, function (item, i) {
                var img = item.querySelector('img');
                var image = images[i];

                if (image && img) {
                    if (image.src !== img.src // Title changed (#408)
                        || image.alt !== img.alt) {
                        changedIndexes.push(i);
                    }
                } else {
                    changedIndexes.push(i);
                }
            });
            setStyle(this.list, {
                width: 'auto'
            });
            this.initList();

            if (this.isShown) {
                if (this.length) {
                    if (this.viewed) {
                        var changedIndex = changedIndexes.indexOf(this.index);

                        if (changedIndex >= 0) {
                            this.viewed = false;
                            this.view(Math.max(Math.min(this.index - changedIndex, this.length - 1), 0));
                        } else {
                            var activeItem = this.items[this.index]; // Reactivate the current viewing item after reset the list.

                            addClass(activeItem, CLASS_ACTIVE);
                            activeItem.setAttribute('aria-selected', true);
                        }
                    }
                } else {
                    this.image = null;
                    this.viewed = false;
                    this.index = 0;
                    this.imageData = {};
                    this.canvas.innerHTML = '';
                    this.title.innerHTML = '';
                }
            }
        } else {
            this.build();
        }

        return this;
    },
    // Destroy the viewer
    destroy: function destroy() {
        var element = this.element,
            options = this.options;

        if (!element[NAMESPACE]) {
            return this;
        }

        this.destroyed = true;

        if (this.ready) {
            if (this.played) {
                this.stop();
            }

            if (options.inline) {
                if (this.fulled) {
                    this.exit();
                }

                this.unbind();
            } else if (this.isShown) {
                if (this.viewing) {
                    if (this.imageRendering) {
                        this.imageRendering.abort();
                    } else if (this.imageInitializing) {
                        this.imageInitializing.abort();
                    }
                }

                if (this.hiding) {
                    this.transitioning.abort();
                }

                this.hidden();
            } else if (this.showing) {
                this.transitioning.abort();
                this.hidden();
            }

            this.ready = false;
            this.viewer.parentNode.removeChild(this.viewer);
        } else if (options.inline) {
            if (this.delaying) {
                this.delaying.abort();
            } else if (this.initializing) {
                this.initializing.abort();
            }
        }

        if (!options.inline) {
            removeListener(element, EVENT_CLICK, this.onStart);
        }

        element[NAMESPACE] = undefined;
        return this;
    }
};

var others = {
    getImageURL: function getImageURL(image) {
        var url = this.options.url;

        if (isString(url)) {
            url = image.getAttribute(url);
        } else if (isFunction(url)) {
            url = url.call(this, image);
        } else {
            url = '';
        }

        return url;
    },
    enforceFocus: function enforceFocus() {
        var _this = this;

        this.clearEnforceFocus();
        addListener(document, EVENT_FOCUSIN, this.onFocusin = function (event) {
            var viewer = _this.viewer;
            var target = event.target;

            if (target === document || target === viewer || viewer.contains(target)) {
                return;
            }

            while (target) {
                // Avoid conflicts with other modals (#474, #540)
                if (target.getAttribute('tabindex') !== null || target.getAttribute('aria-modal') === 'true') {
                    return;
                }

                target = target.parentElement;
            }

            viewer.focus();
        });
    },
    clearEnforceFocus: function clearEnforceFocus() {
        if (this.onFocusin) {
            removeListener(document, EVENT_FOCUSIN, this.onFocusin);
            this.onFocusin = null;
        }
    },
    open: function open() {
        var body = this.body;
        addClass(body, CLASS_OPEN);
        body.style.paddingRight = "".concat(this.scrollbarWidth + (parseFloat(this.initialBodyComputedPaddingRight) || 0), "px");
    },
    close: function close() {
        var body = this.body;
        removeClass(body, CLASS_OPEN);
        body.style.paddingRight = this.initialBodyPaddingRight;
    },
    shown: function shown() {
        var element = this.element,
            options = this.options,
            viewer = this.viewer;
        this.fulled = true;
        this.isShown = true;
        this.render();
        this.bind();
        this.showing = false;

        if (options.focus) {
            viewer.focus();
            this.enforceFocus();
        }

        if (isFunction(options.shown)) {
            addListener(element, EVENT_SHOWN, options.shown, {
                once: true
            });
        }

        if (dispatchEvent(element, EVENT_SHOWN) === false) {
            return;
        }

        if (this.ready && this.isShown && !this.hiding) {
            this.view(this.index);
        }
    },
    hidden: function hidden() {
        var element = this.element,
            options = this.options,
            viewer = this.viewer;

        if (options.fucus) {
            this.clearEnforceFocus();
        }

        this.fulled = false;
        this.viewed = false;
        this.isShown = false;
        this.close();
        this.unbind();
        addClass(viewer, CLASS_HIDE);
        viewer.removeAttribute('role');
        viewer.removeAttribute('aria-labelledby');
        viewer.removeAttribute('aria-modal');
        viewer.setAttribute('aria-hidden', true);
        this.resetList();
        this.resetImage();
        this.hiding = false;

        if (!this.destroyed) {
            if (isFunction(options.hidden)) {
                addListener(element, EVENT_HIDDEN, options.hidden, {
                    once: true
                });
            }

            dispatchEvent(element, EVENT_HIDDEN, null, {
                cancelable: false
            });
        }
    },
    requestFullscreen: function requestFullscreen(options) {
        var document = this.element.ownerDocument;

        if (this.fulled && !(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
            var documentElement = document.documentElement; // Element.requestFullscreen()

            if (documentElement.requestFullscreen) {
                // Avoid TypeError when convert `options` to dictionary
                if (isPlainObject(options)) {
                    documentElement.requestFullscreen(options);
                } else {
                    documentElement.requestFullscreen();
                }
            } else if (documentElement.webkitRequestFullscreen) {
                documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
            } else if (documentElement.mozRequestFullScreen) {
                documentElement.mozRequestFullScreen();
            } else if (documentElement.msRequestFullscreen) {
                documentElement.msRequestFullscreen();
            }
        }
    },
    exitFullscreen: function exitFullscreen() {
        var document = this.element.ownerDocument;

        if (this.fulled && (document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement)) {
            // Document.exitFullscreen()
            if (document.exitFullscreen) {
                document.exitFullscreen();
            } else if (document.webkitExitFullscreen) {
                document.webkitExitFullscreen();
            } else if (document.mozCancelFullScreen) {
                document.mozCancelFullScreen();
            } else if (document.msExitFullscreen) {
                document.msExitFullscreen();
            }
        }
    },
    change: function change(event) {
        var options = this.options,
            pointers = this.pointers;
        var pointer = pointers[Object.keys(pointers)[0]]; // In the case of the `pointers` object is empty (#421)

        if (!pointer) {
            return;
        }

        var offsetX = pointer.endX - pointer.startX;
        var offsetY = pointer.endY - pointer.startY;

        switch (this.action) {
            // Move the current image
            case ACTION_MOVE:
                this.move(offsetX, offsetY, event);
                break;
            // Zoom the current image

            case ACTION_ZOOM:
                this.zoom(getMaxZoomRatio(pointers), false, event);
                break;

            case ACTION_SWITCH:
            {
                this.action = 'switched';
                var absoluteOffsetX = Math.abs(offsetX);

                if (absoluteOffsetX > 1 && absoluteOffsetX > Math.abs(offsetY)) {
                    // Empty `pointers` as `touchend` event will not be fired after swiped in iOS browsers.
                    this.pointers = {};

                    if (offsetX > 1) {
                        this.prev(options.loop);
                    } else if (offsetX < -1) {
                        this.next(options.loop);
                    }
                }

                break;
            }
        } // Override


        forEach(pointers, function (p) {
            p.startX = p.endX;
            p.startY = p.endY;
        });
    },
    isSwitchable: function isSwitchable() {
        var imageData = this.imageData,
            viewerData = this.viewerData;
        return this.length > 1 && imageData.x >= 0 && imageData.y >= 0 && imageData.width <= viewerData.width && imageData.height <= viewerData.height;
    }
};

var AnotherViewer = WINDOW.Viewer;

var getUniqueID = function (id) {
    return function () {
        id += 1;
        return id;
    };
}(-1);

var Viewer = /*#__PURE__*/function () {
    /**
     * Create a new Viewer.
     * @param {Element} element - The target element for viewing.
     * @param {Object} [options={}] - The configuration options.
     */
    function Viewer(element) {
        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};

        _classCallCheck(this, Viewer);

        if (!element || element.nodeType !== 1) {
            throw new Error('The first argument is required and must be an element.');
        }

        this.element = element;
        this.options = assign({}, DEFAULTS, isPlainObject(options) && options);
        this.action = false;
        this.fading = false;
        this.fulled = false;
        this.hiding = false;
        this.imageClicked = false;
        this.imageData = {};
        this.index = this.options.initialViewIndex;
        this.isImg = false;
        this.isShown = false;
        this.length = 0;
        this.moving = false;
        this.played = false;
        this.playing = false;
        this.pointers = {};
        this.ready = false;
        this.rotating = false;
        this.scaling = false;
        this.showing = false;
        this.timeout = false;
        this.tooltipping = false;
        this.viewed = false;
        this.viewing = false;
        this.wheeling = false;
        this.zooming = false;
        this.id = getUniqueID();
        this.init();
    }

    _createClass(Viewer, [{
        key: "init",
        value: function init() {
            var _this = this;

            var element = this.element,
                options = this.options;

            if (element[NAMESPACE]) {
                return;
            }

            element[NAMESPACE] = this; // The `focus` option requires the `keyboard` option set to `true`.

            if (options.focus && !options.keyboard) {
                options.focus = false;
            }

            var isImg = element.localName === 'img';
            var images = [];
            forEach(isImg ? [element] : element.querySelectorAll('img'), function (image) {
                if (isFunction(options.filter)) {
                    if (options.filter.call(_this, image)) {
                        images.push(image);
                    }
                } else if (_this.getImageURL(image)) {
                    images.push(image);
                }
            });
            this.isImg = isImg;
            this.length = images.length;
            this.images = images;
            this.initBody(); // Override `transition` option if it is not supported

            if (isUndefined(document.createElement(NAMESPACE).style.transition)) {
                options.transition = false;
            }

            if (options.inline) {
                var count = 0;

                var progress = function progress() {
                    count += 1;

                    if (count === _this.length) {
                        var timeout;
                        _this.initializing = false;
                        _this.delaying = {
                            abort: function abort() {
                                clearTimeout(timeout);
                            }
                        }; // build asynchronously to keep `this.viewer` is accessible in `ready` event handler.

                        timeout = setTimeout(function () {
                            _this.delaying = false;

                            _this.build();
                        }, 0);
                    }
                };

                this.initializing = {
                    abort: function abort() {
                        forEach(images, function (image) {
                            if (!image.complete) {
                                removeListener(image, EVENT_LOAD, progress);
                                removeListener(image, EVENT_ERROR, progress);
                            }
                        });
                    }
                };
                forEach(images, function (image) {
                    if (image.complete) {
                        progress();
                    } else {
                        var onLoad;
                        var onError;
                        addListener(image, EVENT_LOAD, onLoad = function onLoad() {
                            removeListener(image, EVENT_ERROR, onError);
                            progress();
                        }, {
                            once: true
                        });
                        addListener(image, EVENT_ERROR, onError = function onError() {
                            removeListener(image, EVENT_LOAD, onLoad);
                            progress();
                        }, {
                            once: true
                        });
                    }
                });
            } else {
                addListener(element, EVENT_CLICK, this.onStart = function (_ref) {
                    var target = _ref.target;

                    if (target.localName === 'img' && (!isFunction(options.filter) || options.filter.call(_this, target))) {
                        _this.view(_this.images.indexOf(target));
                    }
                });
            }
        }
    }, {
        key: "build",
        value: function build() {
            if (this.ready) {
                return;
            }

            var element = this.element,
                options = this.options;
            var parent = element.parentNode;
            var template = document.createElement('div');
            template.innerHTML = TEMPLATE;
            var viewer = template.querySelector(".".concat(NAMESPACE, "-container"));
            var title = viewer.querySelector(".".concat(NAMESPACE, "-title"));
            var toolbar = viewer.querySelector(".".concat(NAMESPACE, "-toolbar"));
            var navbar = viewer.querySelector(".".concat(NAMESPACE, "-navbar"));
            var button = viewer.querySelector(".".concat(NAMESPACE, "-button"));
            var canvas = viewer.querySelector(".".concat(NAMESPACE, "-canvas"));
            this.parent = parent;
            this.viewer = viewer;
            this.title = title;
            this.toolbar = toolbar;
            this.navbar = navbar;
            this.button = button;
            this.canvas = canvas;
            this.footer = viewer.querySelector(".".concat(NAMESPACE, "-footer"));
            this.tooltipBox = viewer.querySelector(".".concat(NAMESPACE, "-tooltip"));
            this.player = viewer.querySelector(".".concat(NAMESPACE, "-player"));
            this.list = viewer.querySelector(".".concat(NAMESPACE, "-list"));
            viewer.id = "".concat(NAMESPACE).concat(this.id);
            title.id = "".concat(NAMESPACE, "Title").concat(this.id);
            addClass(title, !options.title ? CLASS_HIDE : getResponsiveClass(Array.isArray(options.title) ? options.title[0] : options.title));
            addClass(navbar, !options.navbar ? CLASS_HIDE : getResponsiveClass(options.navbar));
            toggleClass(button, CLASS_HIDE, !options.button);

            if (options.keyboard) {
                button.setAttribute('tabindex', 0);
            }

            if (options.backdrop) {
                addClass(viewer, "".concat(NAMESPACE, "-backdrop"));

                if (!options.inline && options.backdrop !== 'static') {
                    setData(canvas, DATA_ACTION, 'hide');
                }
            }

            if (isString(options.className) && options.className) {
                // In case there are multiple class names
                options.className.split(REGEXP_SPACES).forEach(function (className) {
                    addClass(viewer, className);
                });
            }

            if (options.toolbar) {
                var list = document.createElement('ul');
                var custom = isPlainObject(options.toolbar);
                var zoomButtons = BUTTONS.slice(0, 3);
                var rotateButtons = BUTTONS.slice(7, 9);
                var scaleButtons = BUTTONS.slice(9);

                if (!custom) {
                    addClass(toolbar, getResponsiveClass(options.toolbar));
                }

                forEach(custom ? options.toolbar : BUTTONS, function (value, index) {
                    var deep = custom && isPlainObject(value);
                    var name = custom ? hyphenate(index) : value;
                    var show = deep && !isUndefined(value.show) ? value.show : value;

                    if (!show || !options.zoomable && zoomButtons.indexOf(name) !== -1 || !options.rotatable && rotateButtons.indexOf(name) !== -1 || !options.scalable && scaleButtons.indexOf(name) !== -1) {
                        return;
                    }

                    var size = deep && !isUndefined(value.size) ? value.size : value;
                    var click = deep && !isUndefined(value.click) ? value.click : value;
                    var item = document.createElement('li');

                    if (options.keyboard) {
                        item.setAttribute('tabindex', 0);
                    }

                    item.setAttribute('role', 'button');
                    addClass(item, "".concat(NAMESPACE, "-").concat(name));

                    if (!isFunction(click)) {
                        setData(item, DATA_ACTION, name);
                    }

                    if (isNumber(show)) {
                        addClass(item, getResponsiveClass(show));
                    }

                    if (['small', 'large'].indexOf(size) !== -1) {
                        addClass(item, "".concat(NAMESPACE, "-").concat(size));
                    } else if (name === 'play') {
                        addClass(item, "".concat(NAMESPACE, "-large"));
                    }

                    if (isFunction(click)) {
                        addListener(item, EVENT_CLICK, click);
                    }

                    list.appendChild(item);
                });
                toolbar.appendChild(list);
            } else {
                addClass(toolbar, CLASS_HIDE);
            }

            if (!options.rotatable) {
                var rotates = toolbar.querySelectorAll('li[class*="rotate"]');
                addClass(rotates, CLASS_INVISIBLE);
                forEach(rotates, function (rotate) {
                    toolbar.appendChild(rotate);
                });
            }

            if (options.inline) {
                addClass(button, CLASS_FULLSCREEN);
                setStyle(viewer, {
                    zIndex: options.zIndexInline
                });

                if (window.getComputedStyle(parent).position === 'static') {
                    setStyle(parent, {
                        position: 'relative'
                    });
                }

                parent.insertBefore(viewer, element.nextSibling);
            } else {
                addClass(button, CLASS_CLOSE);
                addClass(viewer, CLASS_FIXED);
                addClass(viewer, CLASS_FADE);
                addClass(viewer, CLASS_HIDE);
                setStyle(viewer, {
                    zIndex: options.zIndex
                });
                var container = options.container;

                if (isString(container)) {
                    container = element.ownerDocument.querySelector(container);
                }

                if (!container) {
                    container = this.body;
                }

                container.appendChild(viewer);
            }

            if (options.inline) {
                this.render();
                this.bind();
                this.isShown = true;
            }

            this.ready = true;

            if (isFunction(options.ready)) {
                addListener(element, EVENT_READY, options.ready, {
                    once: true
                });
            }

            if (dispatchEvent(element, EVENT_READY) === false) {
                this.ready = false;
                return;
            }

            if (this.ready && options.inline) {
                this.view(this.index);
            }
        }
        /**
         * Get the no conflict viewer class.
         * @returns {Viewer} The viewer class.
         */

    }], [{
        key: "noConflict",
        value: function noConflict() {
            window.Viewer = AnotherViewer;
            return Viewer;
        }
        /**
         * Change the default options.
         * @param {Object} options - The new default options.
         */

    }, {
        key: "setDefaults",
        value: function setDefaults(options) {
            assign(DEFAULTS, isPlainObject(options) && options);
        }
    }]);

    return Viewer;
}();

assign(Viewer.prototype, render, events, handlers, methods, others);

export { Viewer as default };
